Clay City, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.3 °C (low) to 19.1 °C (high). Annual precipitation averages 1254.8 Millimeters. Clay City is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.8 °C | 6.3 °C | 85.6 mm |
| February | -3.2 °C | 8.6 °C | 93.73 mm |
| March | -0.1 °C | 13.7 °C | 109.73 mm |
| April | 5.4 °C | 19.9 °C | 111 mm |
| May | 11.1 °C | 23.9 °C | 134.62 mm |
| June | 15.7 °C | 28.1 °C | 122.43 mm |
| July | 17.9 °C | 29.7 °C | 134.11 mm |
| August | 17 °C | 29.3 °C | 98.55 mm |
| September | 12.9 °C | 26.4 °C | 94.49 mm |
| October | 6.1 °C | 20.4 °C | 83.06 mm |
| November | 0.2 °C | 14 °C | 82.3 mm |
| December | -2.6 °C | 8.4 °C | 105.16 mm |
| Annual | 6.3 °C | 19.1 °C | 1254.78 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |